Oh yeah, one more thing...
Have a great MC for a raffle. I really mean it. Having the right person running it is really critical.
It's one thing to be a great organized event director - There are lots of styles that can work. The promoter style, the cautious careful style, the analytical, the level headed conflict solver, the pragmatist.
However, there is that magic personality that can open up people's wallets like no other. I can't describe it, but you know it. It's the person that can make people say yes. Get that person.
And that right person will make the raffle not only a part of the event, but boatloads more successful and they will likely make it a feature and part of the event memory.
Best of luck!